Adjusted odds ratio (OR) of being a smoker (lifetime smoking ⩾ 100 cigarettes) according to student characteristics3-150 (n = 1265)
| Student characteristic | Adjusted OR | 95% CI | p Value |
| Number of CPI's owned | |||
| 0 | Reference | ||
| 1 | 2.7 | 1.7 to 4.1 | < 0.0001 |
| 2 | 3.4 | 1.9 to 5.9 | < 0.0001 |
| ⩾ 3 | 8.4 | 5.0 to 14.2 | < 0.0001 |
| Friend and family smoking | |||
| None | reference | ||
| Family only | 2.5 | 0.2 to 26.1 | 0.22 |
| Friends only | 4.7 | 0.6 to 36.4 | 0.03 |
| Family and friends | 17.7 | 2.3 to 129.9 | 0.006 |
↵3-150 This model also includes controls for grade in school, sex, school performance, and perceived prevalence of smoking.